package com.wkbb.common.utils;

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import java.io.IOException;
import java.security.SecureRandom;
import java.util.Base64;

public class DesUtil {

    private final static String DES = "DES";
    private final static String DES_KEY = "wbidi34%(&@)(()db!!@#$%";
    private final static String EN_KEY = "$%Ed134ddsfewkbb2017,";


    /*public static void main(String[] args) throws Exception {
        //String data = "csst";        
    	String data = "NGpseX";
        System.err.println(encrypt(data));
        System.err.println(decrypt(encrypt(data)));
        
      
 
    }*/

    /**
     * Description 根据键值进行加密
     *
     * @param data
     * @return
     * @throws Exception
     */
    public static String encrypt(String data) throws Exception {
        return encrypt(EN_KEY + data, DES_KEY);
    }

    /**
     * Description 根据键值进行解密
     *
     * @param data
     * @return
     * @throws IOException
     * @throws Exception
     */
    public static String decrypt(String data) throws IOException,
            Exception {
        String[] rArray = decrypt(data, DES_KEY).split(",");
        //简单的解密算法
        if (rArray.length < 2) {
            throw new Exception("数据库密码解密失败！");
        }
        return rArray[1];
    }

    /**
     * Description 根据键值进行加密
     *
     * @param data
     * @param key  加密键byte数组
     * @return
     * @throws Exception
     */
    public static String encrypt(String data, String key) throws Exception {
        byte[] bt = encrypt(data.getBytes(), key.getBytes());
//        String strs = new BASE64Encoder().encode(bt);
        String strs = Base64.getEncoder().encodeToString(bt);
        return strs;
    }

    /**
     * Description 根据键值进行解密
     *
     * @param data
     * @param key  加密键byte数组
     * @return
     * @throws IOException
     * @throws Exception
     */
    public static String decrypt(String data, String key) throws IOException,
            Exception {
        if (data == null) {
            return null;
        }
//        BASE64Decoder decoder = new BASE64Decoder();
//        byte[] buf = decoder.decodeBuffer(data);
        byte[] buf = Base64.getDecoder().decode(data);
        byte[] bt = decrypt(buf, key.getBytes());
        return new String(bt);
    }

    /**
     * Description 根据键值进行加密
     *
     * @param data
     * @param key  加密键byte数组
     * @return
     * @throws Exception
     */
    private static byte[] encrypt(byte[] data, byte[] key) throws Exception {
        // 生成一个可信任的随机数源
        SecureRandom sr = new SecureRandom();

        // 从原始密钥数据创建DESKeySpec对象
        DESKeySpec dks = new DESKeySpec(key);

        // 创建一个密钥工厂，然后用它把DESKeySpec转换成SecretKey对象
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES);
        SecretKey securekey = keyFactory.generateSecret(dks);

        // Cipher对象实际完成加密操作
        Cipher cipher = Cipher.getInstance(DES);

        // 用密钥初始化Cipher对象
        cipher.init(Cipher.ENCRYPT_MODE, securekey, sr);

        return cipher.doFinal(data);
    }


    /**
     * Description 根据键值进行解密
     *
     * @param data
     * @param key  加密键byte数组
     * @return
     * @throws Exception
     */
    private static byte[] decrypt(byte[] data, byte[] key) throws Exception {
        // 生成一个可信任的随机数源
        SecureRandom sr = new SecureRandom();

        // 从原始密钥数据创建DESKeySpec对象
        DESKeySpec dks = new DESKeySpec(key);

        // 创建一个密钥工厂，然后用它把DESKeySpec转换成SecretKey对象
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES);
        SecretKey securekey = keyFactory.generateSecret(dks);

        // Cipher对象实际完成解密操作
        Cipher cipher = Cipher.getInstance(DES);

        // 用密钥初始化Cipher对象
        cipher.init(Cipher.DECRYPT_MODE, securekey, sr);

        return cipher.doFinal(data);
    }


    public static void main(String[] s) {
        String redirect = "http://wux.natapp1.cc/h5/?memberType=2&accountId=781&storeNumber=9602069842&referrer=oKdpg5rn2ZvctlFWurJ6fB2ceU2c#/FirmamentMain";
        try {
            redirect = Base64Util.encodeStr(DesUtil.encrypt(redirect));
//            redirect = DesUtil.encrypt(redirect);
            System.out.println(redirect);
            System.out.println("====================================");
            String b = Base64Util.decodeStr(redirect);
            System.out.println(b);
            System.out.println("====================================");
            redirect =DesUtil.decrypt(b);
            System.out.println(redirect);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}